US6993937B2 - Preform inlet arrangement for an optical fiber drawing furnace, a furnace provided with that kind of inlet arrangement, and a preform equipped to co-operate with that inlet arrangement - Google Patents

Preform inlet arrangement for an optical fiber drawing furnace, a furnace provided with that kind of inlet arrangement, and a preform equipped to co-operate with that inlet arrangement Download PDF

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Publication number
US6993937B2
US6993937B2 US09/745,414 US74541401A US6993937B2 US 6993937 B2 US6993937 B2 US 6993937B2 US 74541401 A US74541401 A US 74541401A US 6993937 B2 US6993937 B2 US 6993937B2
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United States
Prior art keywords
preform
furnace
seal
inlet
injector
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Expired - Fee Related, expires
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US09/745,414
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English (en)
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US20020092328A1 (en
Inventor
Carlos Pedrido
Bernard Leuenberger
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Draka Comteq BV
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Alcatel SA
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Assigned to ALCATEL reassignment ALCATEL ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEUENBERGER, BERNARD, PEDRIDO, CARLOS
Publication of US20020092328A1 publication Critical patent/US20020092328A1/en
Assigned to DRAKA COMTEQ B.V. reassignment DRAKA COMTEQ B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALCATEL
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/029—Furnaces therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/80—Means for sealing the preform entry or upper end of the furnace
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/80—Means for sealing the preform entry or upper end of the furnace
    • C03B2205/81—Means for sealing the preform entry or upper end of the furnace using gas

Definitions

  • the invention relates to a preform inlet arrangement for an optical fiber drawing furnace, to a furnace provided with that kind of arrangement, and to a preform equipped to co-operate with that arrangement.
  • optical fibers by drawing a heated preform in a furnace necessarily involves phases during which production is stopped for one preform to be replaced by another.
  • Stopping a drawing furnace to replace a preform so that the preform to be replaced can be extracted and its replacement installed under good conditions is known in the art.
  • the principal drawback of that solution is that it entails stopping the production of fiber for a relatively long time, for example approximately three hours. This is because it is necessary to return the furnace to production conditions, in particular to the production temperature, before resuming drawing.
  • the furnace is filled with inert gas during the fiber drawing phase and when replacing one fiber with another the surrounding air can infiltrate into the furnace, which in particular can damage graphite elements inside the furnace which are heated to a high temperature while the furnace is in operation.
  • a drawing furnace preform inlet arrangement which seals the furnace when a preform is present is known in the art.
  • One example of that kind of arrangement is disclosed in particular in the document DE 4 006 839, which describes a rigid seal surrounding the preform at the top of a furnace lid member through which the preform passes and which is adapted internally for injecting an inert gas around the preform inside the furnace.
  • that preform inlet arrangement does not solve the problem of preserving the sealing of the furnace when changing the preform.
  • the invention therefore proposes an inlet arrangement for inserting a preform into a furnace of the type including an enclosure having at its top both an opening to allow insertion of a preform which moves vertically downwards in translation during fiber drawing, and a preform inlet arrangement.
  • Said arrangement comprises an injector situated at the level of the preform inlet opening to inject inert gas onto the perimeter of the preform to fill the enclosure of the furnace.
  • the arrangement also comprises a seal fixed by means of a seal support above the injector and designed to allow the preform to pass therethrough (with the cylindrical main body of the preform being surrounded by the seal to prevent gas circulating between the surrounding environment and the inside of the furnace at the level where the seal is situated.
  • the inlet arrangement further comprises an airlock for closing and sealing the top of the furnace, above the injector, whether a preform is present or absent, and for maintaining a positive internal inert gas pressure at the furnace inlet to prevent the surrounding air entering the furnace inlet.
  • the inlet arrangement comprises:
  • the inlet arrangement injector has inert gas injector vents which are oriented towards its airlock in addition to injector vents oriented towards the inside of the furnace.
  • the invention also proposes a drawing furnace for producing glass fibers which includes an inlet arrangement having at least the feature defined above.
  • the invention further proposes a preform equipped to co-operate with an arrangement as defined above.
  • the preform is more particularly intended for producing glass fiber in a furnace by drawing one end, referred to as the drawing end, of its cylindrical main body. It is provided with a support member mounted at one end of a rod which extends the body at its upper end, opposite the drawing end, and which has a diameter less than that of the body.
  • the preform carries a continuity tube which is mounted on the rod between the body and the support member and whose outside diameter corresponds to that of the body, which it extends virtually without discontinuity.
  • FIG. 1 is a diagram of an optical fiber drawing furnace into which a preform has been partly inserted through a prior art inlet arrangement.
  • FIG. 2 is a diagram of an optical fiber drawing furnace including an inlet arrangement of the invention and shows a preform adapted to be used with that kind of arrangement at an insertion position.
  • FIG. 3 is a diagram of the furnace and the preform shown in FIG. 2 under normal production conditions for drawing fiber.
  • FIG. 4 is a diagram of the furnace and the preform shown in FIG. 2 under normal production conditions, at the end of processing the preform, before removing it.
  • FIG. 1 shows a standard drawing furnace 1 for producing an optical fiber 2 from a preform 3 .
  • the furnace includes an enclosure 4 at the top of which is an opening through which enters a preform 2 which moves downwards in translation during fiber drawing.
  • the bottom of the enclosure 3 of the furnace is also open to enable downward movement of the fiber 2 obtained by drawing the bottom end of the preform 3 with the glass of the preform softened by the heat generated by the furnace.
  • cylindrical cladding 5 is positioned vertically in the furnace between the preform inlet opening and the fiber outlet opening. This is to ensure uniform heating of the part of the preform from which the fiber is extracted and the part of the fiber that has just been extracted from the preform.
  • the drawing operation is carried out in a controlled atmosphere inside the furnace, into which an inert gas is conventionally injected.
  • this injection is effected via a cylindrical injector 6 which is positioned on the furnace at the level of the preform inlet opening to inject gas onto the perimeter of the preform and towards the inside of the cladding 5 inside the furnace.
  • a seal 7 is mounted in a seal support 8 positioned above the injector 6 .
  • the preform 3 can pass through it and it surrounds the cylindrical main body 9 of the preform to prevent gas from flowing between the surrounding environment and the inside of the furnace at the level at which it is situated when the drawing end of the preform, from which the fiber is extracted, is inside the furnace.
  • the cylindrical body 9 of the preform 3 is conventionally extended by a rod 11 which is accommodated under a top cap 10 above the furnace and through which the rod 11 passes.
  • the rod 11 of a preform generally has a diameter smaller than that of the body of the preform, which is possible because it does not constitute a part of the preform from which fiber is extracted. This is known in the art.
  • a support member 12 is fixed to the end of the rod 11 remote from the body 9 . It enables the preform to move relative to the furnace 4 in vertical translation between an inlet position in which the preform is above the furnace and can be inserted in or removed from the furnace, and an extreme position in which at least part of the rod is inside the furnace and which is obtained when the length of the body has been reduced to its minimum value by the drawing operation.
  • the invention prevents this by providing an airlock 13 which closes and seals the top of the furnace 3 in the absence of a preform and during preform insertion or removal and preferably maintains positive internal pressure at the furnace inlet to prevent the surrounding air entering, which air is expelled by the injected inert gas.
  • FIGS. 2 , 3 and 4 show an embodiment of a drawing furnace equipped with this kind of airlock, with a vertical preform 3 ′ shown in a different position in each of the figures.
  • the drawing furnace 1 ′ corresponds to the furnace 1 shown in FIG. 1 , with an enclosure 4 ′ and cladding 5 ′ corresponding to the enclosure 4 and the cladding 5 of the furnace 1 .
  • An injector 6 ′corresponding to the injector 6 of the furnace 1 is mounted above the enclosure 4 ′ at the level of the preform inlet opening to the enclosure, which it surrounds.
  • the injector 6 ′ includes vents 14 and 15 inclined towards the preform and some of which point downwards towards the furnace and others of which point upwards.
  • a closure member 16 is positioned above the injector 6 ′ and closes and seals the top of the furnace in the absence of a preform. It has two moving closure parts which cover the axial opening for the preform at the center of the injector 6 ′ when they are moved into contact with each other.
  • the opening in the closure member 16 adapted to allow downward movement of a preform into the furnace is formed by moving apart its two moving closure parts. The is effected by moving both parts simultaneously, for example, and employs displacement means of the usual kind; the same applies to moving the moving parts towards each other on closing.
  • the displacement means which are not shown here, are of the mechanical, electrical, pneumatic or hydraulic type, for example. This is known in the art.
  • An airlock chamber is provided above the closure member 16 and is defined in the longitudinal direction by two stages of seals 17 A and 17 B through which the preform body slides when it moves vertically.
  • the seals are stacked cylindrical graphite seals and are held by seal supports 18 A and 18 B.
  • the seal supports are fastened to a support structure, not shown, of the preform inlet arrangement that they form in conjunction with the seals, the closure member and the injector in this embodiment.
  • the seals 17 A, 17 B are also cooled, for example by conduction, to prevent premature deterioration. This is known in the art.
  • the two stages of seals are separated by a distance chosen so that the airlock function provided by the seals 17 A and 17 B in conjunction with the closure member 16 is always fulfilled, involving the participation of at least one of the stages of seals, as soon as a preform is inserted into the inlet arrangement of which the seals form part and for as long as the length of the preform body is greater than or at least equal to a maximum drawing limit for the preform corresponding to a particular minimum length “lmin”.
  • a connecting sleeve 19 of particular length is placed between the seal supports 18 A and 18 B. The length of the sleeve depends on the minimum preform body length and therefore in practice on the drawing end cone that remains at the drawing end after the maximum processing of a preform in the drawing furnace.
  • the rod of each preform is sheathed over the length of the rod between the body 9 ′ and the support member 12 ′ by a hollow continuity tube 20 whose outside diameter corresponds to that of the body 9 ′ that it extends, virtually without discontinuity, as can be seen in FIGS. 2 to 4 .
  • the tube is made of quartz, for example, and it is threaded over the preform before fixing the retaining part 12 ′.
  • Inserting a preform 31 into a furnace entails positioning the preform, preferably equipped with a continuity tube 20 , above the airlock 13 of the inlet arrangement 13 of the furnace, as can be seen in FIG. 2 .
  • This position is conventionally obtained by fixing the support part 12 ′ of the preform to a vertically movable positioning and support system known in the art and not shown here.
  • a system of this kind is described in the context of a particular fiber production installation in U.S. Pat. No. 4,309,201.
  • the preform 3 ′ is lowered until it enters the airlock 13 of the furnace inlet arrangement. It can descend through the closure member 16 which closes the passage leading towards the inside of the enclosure 4 ′, as shown in FIG. 2 , only if the furnace is already operating and is therefore filled with inert gas and at the fiber drawing temperature.
  • the closure member 16 It is then possible to open the closure member 16 , by moving its two moving parts move away from each other in the embodiment of the closure member described above.
  • the inert gas injected via the vents 15 of the injector fills the airlock.
  • the preform 3 ′ continues to move downwards until its drawing end is at a position inside the cladding 5 ′ such that the fiber drawing operation can be started. Fiber drawing continues as required and leads to the production of a fiber 2 ′ at the drawing end of the preform.
  • the body 9 ′ is at this time partly accommodated in the axial openings of the two stages of seals 17 A and 17 B and in the cladding 5 ′, inside which its drawing end is located, as can be seen in FIG. 3 .
  • the inert gas is injected via the vents in the injector 6 ′ and entirely towards the inside of the cladding, since the airlock is no longer supplied with gas because of the presence of the preform body in the axial opening of the lower stage seals 17 B.
  • the preform 3 ′ is progressively lowered as fiber is produced from the body 9 ′, whose size is decreased by the drawing operation.
  • the height of the preform body is reduced to such a degree that the top of the body descends to the level of the top stage seals 17 A. If the preform is not equipped with a continuity tube, the drawing operation in progress must be stopped before the reduction in size at the level of the junction between the body 9 ′ and the rod 11 ′ enters the axial opening of the lower stage seals 17 B to prevent the risk of air penetrating through this opening when it is no longer totally closed off.
  • the upper stage seals 17 A continue to fulfill their function by co-operating with the continuity tube, and because of the chosen distance between the stages, which is fixed by the length of the sleeve 19 , it is possible to close the closure member 16 as soon as the drawing end of the preform 3 ′ has risen above it, at which time the airlock is still sealed from the external environment. It is then possible to continue the removal of the preform from the inlet arrangement with no risk to the furnace once the closure member has been closed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
US09/745,414 1999-12-27 2000-12-26 Preform inlet arrangement for an optical fiber drawing furnace, a furnace provided with that kind of inlet arrangement, and a preform equipped to co-operate with that inlet arrangement Expired - Fee Related US6993937B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9916526A FR2802916B1 (fr) 1999-12-27 1999-12-27 Agencement d'entree de preforme pour four de tirage de fibre optique, four dote d'un tel agencement et preforme equipee pour cooperer avec cet agencement
FR9916526 1999-12-27

Publications (2)

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US20020092328A1 US20020092328A1 (en) 2002-07-18
US6993937B2 true US6993937B2 (en) 2006-02-07

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Country Status (6)

Country Link
US (1) US6993937B2 (fr)
EP (1) EP1112978B1 (fr)
AT (1) ATE271022T1 (fr)
DE (1) DE60012125T2 (fr)
DK (1) DK1112978T3 (fr)
FR (1) FR2802916B1 (fr)

Families Citing this family (11)

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Publication number Priority date Publication date Assignee Title
FI113533B (fi) * 2002-01-18 2004-05-14 Photonium Oy Kuidunvetouunin tiivistys
FI113758B (fi) * 2002-12-05 2004-06-15 Nextrom Holding Sa Menetelmä ja laite optisten kuitujen valmistamiseksi
JP5148367B2 (ja) * 2007-05-29 2013-02-20 信越化学工業株式会社 高周波誘導熱プラズマトーチを用いた光ファイバプリフォームの製造方法
JP5023016B2 (ja) * 2007-08-10 2012-09-12 信越化学工業株式会社 光ファイバ製造装置および線引き炉のシール方法
US7892460B1 (en) * 2009-02-17 2011-02-22 Paradigm Optics Enclosed drawing method
JP4817339B2 (ja) * 2009-02-17 2011-11-16 信越化学工業株式会社 加熱炉のシール部材
WO2014115849A1 (fr) * 2013-01-24 2014-07-31 住友電気工業株式会社 Structure d'étanchéité pour four d'étirage de fibres optiques et procédé d'étirage de fibres optiques
JP6119299B2 (ja) * 2013-02-25 2017-04-26 住友電気工業株式会社 光ファイバ線引方法
JP6513147B2 (ja) * 2017-08-01 2019-05-15 株式会社フジクラ 製造方法及びキャップ
KR102365316B1 (ko) 2017-12-20 2022-02-23 헤래우스 쿼츠 노쓰 아메리카 엘엘씨 광학 모재 노를 위한 가변 직경 밀봉구
CN111734826B (zh) * 2020-07-23 2021-01-26 西安赛隆金属材料有限责任公司 复合密封组件、等离子旋转电极雾化制粉设备与制粉方法

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US3540870A (en) * 1968-05-07 1970-11-17 Us Air Force Apparatus for drawing and coating quartz glass fibers
US4030901A (en) * 1976-07-19 1977-06-21 Bell Telephone Laboratories, Incorporated Method for drawing fibers
US4154592A (en) * 1978-02-21 1979-05-15 Corning Glass Works Method of drawing optical filaments
GB2044751A (en) 1979-03-21 1980-10-22 Philips Nv Method of making optical fibres
US4477274A (en) * 1983-07-27 1984-10-16 U.S. Philips Corporation Device for drawing an optical fibre
JPS6081039A (ja) 1983-10-07 1985-05-09 Sumitomo Electric Ind Ltd 光フアイバ−線引炉の気密方法
JPS6120493A (ja) * 1984-07-06 1986-01-29 Matsushita Electric Ind Co Ltd 同軸平板スピ−カユニツト
US4673427A (en) * 1982-10-04 1987-06-16 U.S. Philips Corporation Method of and device for drawing an optical fiber from a solid preform consisting substantially of SiO2 and doped SiO2
JPS63176330A (ja) * 1987-01-19 1988-07-20 Sumitomo Electric Ind Ltd 光フアイバ用線引炉
DE3903466A1 (de) 1989-02-06 1990-08-09 Rheydt Kabelwerk Ag Heizofen fuer die innenbeschichtung von vorformen fuer lichtwellenleiter
US4988374A (en) * 1987-11-12 1991-01-29 Stc Plc Method and apparatus for contaminant removal in manufacturing optical fibre
DE3925961A1 (de) * 1989-08-05 1991-02-07 Rheydt Kabelwerk Ag Vorrichtung zum ziehen einer glasfaser, die als lichtwellenleiter dient
DE4006839A1 (de) 1990-03-05 1991-09-12 Rheydt Kabelwerk Ag Vorrichtung zum abdichten thermisch beanspruchter zylinder
JPH05147969A (ja) * 1991-12-02 1993-06-15 Sumitomo Electric Ind Ltd 光フアイバ線引炉
JPH06199537A (ja) * 1993-01-05 1994-07-19 Sumitomo Electric Ind Ltd 光ファイバ線引炉
JPH06199536A (ja) * 1993-01-05 1994-07-19 Sumitomo Electric Ind Ltd 光ファイバの線引炉
GB2305663A (en) 1995-09-29 1997-04-16 Samsung Electronics Co Ltd Optical fibre spinning apparatus and method
EP0803478A1 (fr) 1996-04-23 1997-10-29 Alcatel Fibres Optiques Dispositif de fibrage d'une préforme de fibre optique
US5713979A (en) * 1992-05-14 1998-02-03 Tsl Group Plc Heat treatment facility for synthetic vitreous silica bodies
EP0849232A1 (fr) 1996-12-17 1998-06-24 Alcatel Procédé et appareil de l'étirage d'une fibre optique à partir d'une préforme
US5974838A (en) * 1998-07-07 1999-11-02 Alcatel Optical fiber graphite furnace featuring an automatic shutter door system for feeding an optical preform
US6192715B1 (en) * 1997-07-24 2001-02-27 The Furukawa Electric Co., Ltd. Furnace for forming optical fiber

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JPS5520260A (en) * 1978-08-01 1980-02-13 Nippon Telegr & Teleph Corp <Ntt> Continuously producing apparatus for optical fiber base material
JPS649832A (en) * 1987-07-01 1989-01-13 Sumitomo Electric Industries Jig for connecting and holding preform for optical fiber
JPS6428242A (en) * 1987-07-23 1989-01-30 Sumitomo Electric Industries Dummy rod for holding optical fiber preform
JPH02145452A (ja) * 1988-11-28 1990-06-04 Furukawa Electric Co Ltd:The 光ファイバの線引き方法

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Publication number Priority date Publication date Assignee Title
US3540870A (en) * 1968-05-07 1970-11-17 Us Air Force Apparatus for drawing and coating quartz glass fibers
US4030901A (en) * 1976-07-19 1977-06-21 Bell Telephone Laboratories, Incorporated Method for drawing fibers
US4154592A (en) * 1978-02-21 1979-05-15 Corning Glass Works Method of drawing optical filaments
GB2044751A (en) 1979-03-21 1980-10-22 Philips Nv Method of making optical fibres
US4309201A (en) * 1979-03-21 1982-01-05 U.S. Philips Corporation Method of and apparatus for manufacturing optical fibres
US4673427A (en) * 1982-10-04 1987-06-16 U.S. Philips Corporation Method of and device for drawing an optical fiber from a solid preform consisting substantially of SiO2 and doped SiO2
US4477274A (en) * 1983-07-27 1984-10-16 U.S. Philips Corporation Device for drawing an optical fibre
JPS6081039A (ja) 1983-10-07 1985-05-09 Sumitomo Electric Ind Ltd 光フアイバ−線引炉の気密方法
JPS6120493A (ja) * 1984-07-06 1986-01-29 Matsushita Electric Ind Co Ltd 同軸平板スピ−カユニツト
JPS63176330A (ja) * 1987-01-19 1988-07-20 Sumitomo Electric Ind Ltd 光フアイバ用線引炉
US4988374A (en) * 1987-11-12 1991-01-29 Stc Plc Method and apparatus for contaminant removal in manufacturing optical fibre
DE3903466A1 (de) 1989-02-06 1990-08-09 Rheydt Kabelwerk Ag Heizofen fuer die innenbeschichtung von vorformen fuer lichtwellenleiter
DE3925961A1 (de) * 1989-08-05 1991-02-07 Rheydt Kabelwerk Ag Vorrichtung zum ziehen einer glasfaser, die als lichtwellenleiter dient
DE4006839A1 (de) 1990-03-05 1991-09-12 Rheydt Kabelwerk Ag Vorrichtung zum abdichten thermisch beanspruchter zylinder
JPH05147969A (ja) * 1991-12-02 1993-06-15 Sumitomo Electric Ind Ltd 光フアイバ線引炉
US5713979A (en) * 1992-05-14 1998-02-03 Tsl Group Plc Heat treatment facility for synthetic vitreous silica bodies
JPH06199537A (ja) * 1993-01-05 1994-07-19 Sumitomo Electric Ind Ltd 光ファイバ線引炉
JPH06199536A (ja) * 1993-01-05 1994-07-19 Sumitomo Electric Ind Ltd 光ファイバの線引炉
GB2305663A (en) 1995-09-29 1997-04-16 Samsung Electronics Co Ltd Optical fibre spinning apparatus and method
EP0803478A1 (fr) 1996-04-23 1997-10-29 Alcatel Fibres Optiques Dispositif de fibrage d'une préforme de fibre optique
EP0849232A1 (fr) 1996-12-17 1998-06-24 Alcatel Procédé et appareil de l'étirage d'une fibre optique à partir d'une préforme
US6192715B1 (en) * 1997-07-24 2001-02-27 The Furukawa Electric Co., Ltd. Furnace for forming optical fiber
US5974838A (en) * 1998-07-07 1999-11-02 Alcatel Optical fiber graphite furnace featuring an automatic shutter door system for feeding an optical preform

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Also Published As

Publication number Publication date
FR2802916A1 (fr) 2001-06-29
EP1112978A1 (fr) 2001-07-04
FR2802916B1 (fr) 2002-03-15
US20020092328A1 (en) 2002-07-18
ATE271022T1 (de) 2004-07-15
DE60012125T2 (de) 2005-07-28
DE60012125D1 (de) 2004-08-19
DK1112978T3 (da) 2004-11-15
EP1112978B1 (fr) 2004-07-14

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